From 403d2ffd6e46cb082b1d16ddf515e1784bee968c Mon Sep 17 00:00:00 2001
From: Christian Breunig <christian@breunig.cc>
Date: Mon, 13 Nov 2023 22:19:44 +0100
Subject: pim6: T5733: add missing FRR PIM6 related features

---
 src/conf_mode/protocols_pim6.py | 57 +++++++++++++++++++++++++++++++----------
 1 file changed, 44 insertions(+), 13 deletions(-)

(limited to 'src/conf_mode/protocols_pim6.py')

diff --git a/src/conf_mode/protocols_pim6.py b/src/conf_mode/protocols_pim6.py
index 6a1235ba5..2003a1014 100755
--- a/src/conf_mode/protocols_pim6.py
+++ b/src/conf_mode/protocols_pim6.py
@@ -15,18 +15,19 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from ipaddress import IPv6Address
+from ipaddress import IPv6Network
 from sys import exit
-from typing import Optional
 
-from vyos import ConfigError, airbag, frr
-from vyos.config import Config, ConfigDict
+from vyos.config import Config
+from vyos.config import config_dict_merge
 from vyos.configdict import node_changed
 from vyos.configverify import verify_interface_exists
 from vyos.template import render_to_string
-
+from vyos import ConfigError
+from vyos import frr
+from vyos import airbag
 airbag.enable()
 
-
 def get_config(config=None):
     if config:
         conf = config
@@ -44,11 +45,21 @@ def get_config(config=None):
     if interfaces_removed:
         pim6['interface_removed'] = list(interfaces_removed)
 
-    return pim6
+    # Bail out early if configuration tree does no longer exist. this must
+    # be done after retrieving the list of interfaces to be removed.
+    if not conf.exists(base):
+        pim6.update({'deleted' : ''})
+        return pim6
 
+    # We have gathered the dict representation of the CLI, but there are default
+    # options which we need to update into the dictionary retrived.
+    default_values = conf.get_config_defaults(**pim6.kwargs, recursive=True)
+
+    pim6 = config_dict_merge(default_values, pim6)
+    return pim6
 
 def verify(pim6):
-    if pim6 is None:
+    if not pim6 or 'deleted' in pim6:
         return
 
     for interface, interface_config in pim6.get('interface', {}).items():
@@ -60,13 +71,34 @@ def verify(pim6):
                 if not IPv6Address(group).is_multicast:
                     raise ConfigError(f"{group} is not a multicast group")
 
+    if 'rp' in pim6:
+        if 'address' not in pim6['rp']:
+            raise ConfigError('PIM6 rendezvous point needs to be defined!')
+
+        # Check unique multicast groups
+        unique = []
+        pim_base_error = 'PIM6 rendezvous point group'
+
+        if {'address', 'prefix-list6'} <= set(pim6['rp']):
+            raise ConfigError(f'{pim_base_error} supports either address or a prefix-list!')
+
+        for address, address_config in pim6['rp']['address'].items():
+            if 'group' not in address_config:
+                raise ConfigError(f'{pim_base_error} should be defined for "{address}"!')
+
+            # Check if it is a multicast group
+            for gr_addr in address_config['group']:
+                if not IPv6Network(gr_addr).is_multicast:
+                    raise ConfigError(f'{pim_base_error} "{gr_addr}" is not a multicast group!')
+                if gr_addr in unique:
+                    raise ConfigError(f'{pim_base_error} must be unique!')
+                unique.append(gr_addr)
 
 def generate(pim6):
-    if pim6 is None:
+    if not pim6 or 'deleted' in pim6:
         return
-
     pim6['new_frr_config'] = render_to_string('frr/pim6d.frr.j2', pim6)
-
+    return None
 
 def apply(pim6):
     if pim6 is None:
@@ -83,13 +115,12 @@ def apply(pim6):
         if key not in pim6:
             continue
         for interface in pim6[key]:
-            frr_cfg.modify_section(
-                f'^interface {interface}', stop_pattern='^exit', remove_stop_mark=True)
+            frr_cfg.modify_section(f'^interface {interface}', stop_pattern='^exit', remove_stop_mark=True)
 
     if 'new_frr_config' in pim6:
         frr_cfg.add_before(frr.default_add_before, pim6['new_frr_config'])
     frr_cfg.commit_configuration(pim6_daemon)
-
+    return None
 
 if __name__ == '__main__':
     try:
-- 
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